Stringer clamp



FIG. 1 is a front perspective view of a stringer clamp showing my new design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof.

The portions in dashed lines do not form part of the design. 

CLAIM The ornamental design for the stringer clamp, as shown and described. 